Physics
An integrated circuit is more advantages than a coventional circuit because

If a part of the integrated circuit fails the entire circuit is simply replaced
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They make the electric equipments more reliable and easier for servicing
A faulty part of a conventional circuit may be difficult to locate and repair

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Physics
What is a compound microscope?

A microscope that has one lens.
A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are convex.
A microscope whose lenses are concave.

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